| | Reynoldsburg, OH | Mariemont, OH | United States |
| Population | 39,803 | 3,497 | 329,725,481 |
| Female Population | 51.9% | 51.6% | 50.5% |
| Male Population | 48.1% | 48.4% | 49.5% |
| Median Age | 36.4 | 39.7 | 38.4 |
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| Population - 2010 | 35,968 | 3,399 | 309,327,143 |
| Population - 2000 | 32,069 | 3,408 | 285,036,114 |
| Population - 1990 | 25,748 | 3,118 | 251,960,433 |
| Pop. 2000 to Now | 19.7% | 0.9% | 15.6% |
| Pop. 1990 to Now | 49.0% | 10.3% | 30.8% |
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| Population Density | 3,583.6 | 3,889.9 | 93.4 |
| Land Area | 11.1 | 0.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Reynoldsburg, OH | Mariemont, OH | United States |
| Age 0 to 4 | 7.2% | 5.3% | 5.9% |
| Age 5 to 9 | 6.7% | 5.9% | 6.1% |
| Age 10 to 14 | 7.2% | 7.1% | 6.6% |
| Age 15 to 17 | 4.6% | 5.7% | 3.9% |
| Age 18 to 20 | 3.7% | 4.0% | 4.0% |
| Age 21 to 24 | 3.4% | 2.0% | 5.2% |
| Age 25 to 34 | 15.2% | 12.3% | 13.8% |
| Age 35 to 44 | 12.3% | 15.9% | 12.9% |
| Age 45 to 54 | 12.3% | 15.0% | 12.6% |
| Age 55 to 59 | 6.5% | 3.3% | 6.7% |
| Age 60 to 64 | 6.2% | 6.5% | 6.3% |
| Age 65 to 74 | 8.6% | 9.0% | 9.6% |
| Age 75 to 84 | 4.4% | 6.5% | 4.5% |
| Age 85 and over | 1.5% | 1.3% | 1.9% |
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| Race | | | |
| | Reynoldsburg, OH | Mariemont, OH | United States |
| White | 54.5% | 95.8% | 59.4% |
| Black | 27.5% | 2.3% | 12.2% |
| Asian | 5.5% | 0.9% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 5.5% | 0.7% | 3.2% |
| Hispanic | 6.8% | 0.2% | 18.4% |
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| Marriage & Family | | | |
| | Reynoldsburg, OH | Mariemont, OH | United States |
| Married Population | 48.0% | 58.8% | 49.8% |
| Currently Married | 46.9% | 58.1% | 48.0% |
| Married but Separated | 1.1% | 0.7% | 1.8% |
| Single Population | 52.0% | 41.2% | 50.2% |
| Never Married | 32.8% | 26.7% | 33.8% |
| Divorced | 13.6% | 11.1% | 10.8% |
| Widowed | 5.6% | 3.4% | 5.6% |
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| Household Size | 2.50 | 2.36 | 2.60 |
| Households | 15,904 | 1,469 | 124,010,992 |
| Family Households | 10,091 | 877 | 80,755,759 |
| Married couple, w/children | 29.1% | 44.5% | 30.5% |
| Married couple, no children | 39.0% | 47.5% | 42.9% |
| Non Family Households | 5,813 | 592 | 43,255,233 |
| Single householder, w/children | 23.5% | 5.6% | 15.8% |
| Single householder, no children | 8.4% | 2.4% | 10.8% |